There are mainly advantage of this loupe series:Wide field of view,Long working distance,Complete edge-to-edge clarity, Use Water disinfectant wiping disinfection. Offer a wide field of view and generous depth of field with high enough magnification for daily procedures. Lens edges and all internal metal and plastic surfaces are blackened to maximize image contrast thus creating excellent clarity, a sharp, clear and bright image. Superior field of view provides vision not attainable by the naked eye allowing entire target to be viewed. Binocular loupes of 2.5X/3.5X can be clipped on your eyeglasses handily.